EGFR and cancer: Plasma-based NGS using a panel of 825 cancer-related genes (Genetron Health; Beijing, China) indicated the presence of EGFR 19del (p.L747_T751del) (VAF: 3.4%), EGFR T790M-cis-C797S (VAF: 0.1%), and EGFR T790M (VAF: 1.9%) (Table 1).